ORGANIC LIGHT-EMITTING DEVICE

摘要

Provided is an organic light-emitting device (OLED), comprising
a first electrode;
a second electrode;
an emission layer disposed between the first electrode and the second electrode;
a hole transport region disposed between the first electrode and the emission layer and comprising a hole transport layer; and
an electron transport region disposed between the emission layer and the second electrode and comprising an electron transport layer,
wherein the emission layer comprises an electron-transporting host and a hole-transporting host,
the hole transport layer comprises a hole transport material,
the electron transport layer comprises an electron transport material, and
the OLED satisfies Equations 1 and 2 below:
0.75eV < I LUMO H(ET) - LUMO H(HT) I ‰¤ 0.90eV
I E(S 1 , H(ET) ) - E(S 1 , H(HT) ) I < 0.15eV
wherein in Equations 1 and 2,
LUMO H(ET) refers to a lowest unoccupied molecular orbital (LUMO) energy level of the electron-transporting host,
LUMO H(HT) refers to an LUMO energy level of the hole-transporting host,
E(S 1 , H(ET) ) refers to a singlet energy level of the electron-transporting host, and
E(S 1 , H(HT) ) refers to a singlet energy level of the hole-transporting host.